check this it will pass all test cases

public static void main(String[] args) { Scanner scan = new Scanner(System.in); if(!scan.hasNext()) { System.out.print("0"); return; }

String s = scan.nextLine();
String[] items = s.trim().split("[ !,?.\\_'@]+");

if(s == ""){
   System.out.println("0");

}
else if(s.length() > 400000){
    return;
}
else{
   System.out.println(items.length);
}

for(String item: items){
    System.out.println(items);
}
scan.close();

}